diff --git a/sdk/src/gsd-tools.ts b/sdk/src/gsd-tools.ts
index 7d72e3b28..28d49d9e9 100644
--- a/sdk/src/gsd-tools.ts
+++ b/sdk/src/gsd-tools.ts
@@ -13,7 +13,7 @@
 
 import type { InitNewProjectInfo, PhaseOpInfo, PhasePlanIndex, RoadmapAnalysis } from './types.js';
 import type { GSDEventStream } from './event-stream.js';
-import { toGSDToolsError } from './query-tools-error-mapper.js';
+import { toToolsErrorFromUnknown } from './query-tools-error-factory.js';
 import { GSDToolsError } from './gsd-tools-error.js';
 import { resolveQueryCommand, type QueryCommandResolution } from './query/query-command-resolution-strategy.js';
 import { QueryExecutionPolicy } from './query-execution-policy.js';
@@ -108,7 +108,7 @@ export class GSDTools {
   }
 
   private toToolsError(command: string, args: string[], err: unknown): GSDToolsError {
-    return toGSDToolsError(command, args, err);
+    return toToolsErrorFromUnknown(command, args, err);
   }
 
   private async dispatchNativeHotpath(
diff --git a/sdk/src/query-tools-error-mapper.test.ts b/sdk/src/query-tools-error-mapper.test.ts
index 8915e5975..a04be72ad 100644
--- a/sdk/src/query-tools-error-mapper.test.ts
+++ b/sdk/src/query-tools-error-mapper.test.ts
@@ -1,21 +1,21 @@
 import { describe, expect, it } from 'vitest';
 import { ErrorClassification, GSDError } from './errors.js';
-import { toGSDToolsError } from './query-tools-error-mapper.js';
+import { toToolsErrorFromUnknown } from './query-tools-error-factory.js';
 
 describe('query tools error mapper', () => {
   it('maps GSDError to GSDToolsError exit code', () => {
-    const err = toGSDToolsError('state', ['load'], new GSDError('bad input', ErrorClassification.Validation));
+    const err = toToolsErrorFromUnknown('state', ['load'], new GSDError('bad input', ErrorClassification.Validation));
     expect(err.exitCode).toBe(10);
     expect(err.message).toBe('bad input');
   });
 
   it('attaches timeout classification when message indicates timeout', () => {
-    const err = toGSDToolsError('state', ['load'], new Error('gsd-tools timed out after 1234ms: state load'));
+    const err = toToolsErrorFromUnknown('state', ['load'], new Error('gsd-tools timed out after 1234ms: state load'));
     expect(err.classification).toEqual({ kind: 'timeout', timeoutMs: 1234 });
   });
 
   it('attaches failure classification for non-timeout failures', () => {
-    const err = toGSDToolsError('state', ['load'], new Error('boom'));
+    const err = toToolsErrorFromUnknown('state', ['load'], new Error('boom'));
     expect(err.classification).toEqual({ kind: 'failure' });
   });
 });
diff --git a/sdk/src/query-tools-error-mapper.ts b/sdk/src/query-tools-error-mapper.ts
deleted file mode 100644
index 835545b6e..000000000
--- a/sdk/src/query-tools-error-mapper.ts
+++ /dev/null
@@ -1,9 +0,0 @@
-import { toToolsErrorFromUnknown } from './query-tools-error-factory.js';
-import type { GSDToolsError } from './gsd-tools-error.js';
-
-/**
- * Module owning projection of internal errors to GSDToolsError contract.
- */
-export function toGSDToolsError(command: string, args: string[], err: unknown): GSDToolsError {
-  return toToolsErrorFromUnknown(command, args, err);
-}